Couple of projects built on micromodem and LibAPRS

Want to thank markqvist for this cool project and other members for support on forum regarding rx improvements, want to share couple of projects I made with micromodem.

First one is a standalone modem based on Arduino, which can work as a Bluetooth TNC (with APRSDroid) and as a USB KISS modem. It is based on LibAPRS, with small customization to allow work in both modes (bluetooth/usb) without need to re-flash or switch anything.

Second is a standalone APRS tracker, with builtin GPS receiver and big nokia screen plus encoder to switch different modes of operation manually. This one is also based on LibAPRS, took a lot of time to optimize everything to fit into 2k or RAM, for example, nokia screen alone requires ~500 bytes for the screen buffer.

Re: Couple of projects built on micromodem and LibAPRS

Yes, these are two different devices.

One is standalone tracker, which has integrated SkyLabs GPS receiver, nokia screen, rotary for user interaction. It has some limitation regarding incoming messages, due to only 2k SRAM on Arduino UNO. Using Arduino MEGA can eliminate these problem.

Another is very simple TNC modem, which has integrated Bluetooth transmitter and can work with Aprsdroid or with PC using usb-serial without need to re-program.

Placed sketchbooks and modified LibAPRS version on github if somebody will be interested, no schematics, only code:

Re: Couple of projects built on micromodem and LibAPRS

user11 wrote:

Yes, these are two different devices.

One is standalone tracker, which has integrated SkyLabs GPS receiver, nokia screen, rotary for user interaction. It has some limitation regarding incoming messages, due to only 2k SRAM on Arduino UNO. Using Arduino MEGA can eliminate these problem.

Another is very simple TNC modem, which has integrated Bluetooth transmitter and can work with Aprsdroid or with PC using usb-serial without need to re-program.

Placed sketchbooks and modified LibAPRS version on github if somebody will be interested, no schematics, only code:

I tried bluetooth_tnc and it decodes and sends to aprsdroid fine, no problems at all. But, no tx! When i use micromodem firmware, there is Tx. The only thing is that I need to put somewhere code to control dorji module...No way with pre-compiled hex, so I thought to use this sketch.. Any clues?